Boiler construction



April 3, 1934. J. J. CAIN BOILER CONSTRUCTION Filed Aug. 2, 1930 5 Sheets-Sheet l ATTORN EY April 3, 1934. J. J. CAIN BOILER CONSTRUCTION Filed Aug. 2. 1950 5 Sheets-Sheet 2 ZZZMM 1 ATTORNEY April 3, 1934. J. J. CAIN BOILER cous'rnuc'rmn Filed Au 2. 1930 3 Sheets-Sheet 3 lNV N OR Patented Apr. 3, 1934 UNITED STATES PATENT OFFICE,

6 Claims.

This invention relates to improvements in boiler constructions and more particularly to high pressure cross tube boilers and the principal object of the invention is the provision of a boiler which provides maximum heating efficiency with minimum fuel consumption and which is capable of producing very high steam pressures as compared with standard pressures at present in use.

An important object of this invention is the provision of a boiler construction which is especially adapted for use as a marine boiler, which eliminates the use of water and steam drums thereby materially reducing the weight of the boiler when made and when in use.

A further object of this invention is the provision of such a structure which may be manufactured at a minimum cost, at the same time being strong and secure and providing maximum circulation, and capable of withstanding high operating pressures with a large factor of safety.

Another object of this invention is the provision of a new and improved superheater arrangement as well as various other improvements in details of construction and arrangement.

To the accomplishment of the foregoing and such other objects as may hereinafter appear, this invention consists in the construction, combination and arrangement of parts hereinafter described and then sought to be defined in the appended claims, reference being had to the accompanying drawings forming a part hereof and which show, merely for the purpose of illustrative disclosure, a preferred embodiment of my invention, it being expressly understood, however, that various changes may be made in practice within the scope of the claims without digressing from my inventive idea.

In the drawings:

Figure 1 represents a front view of a boiler constructed to embody my invention, parts being broken away and shown in section to facilitate the disclosure.

Figure 2 is a sectional side elevation of the construction shown in Figure 1.

Figure 3 is a top plan View of the construction shown in Figures 1 and 2; and

Figure 4 represents a vertical cross section of a detail taken on line 4-4 of Figure 1.

Referring now to the drawings the numeral 1 designates the casing generally, 2 the fire box,

3 the grates and 4 the fire doors. In the construction shown the boiler is of general rectangular appearance both horizontally and vertically.

The boiler itself includes a plurality of front headers 5 and rear headers 6, the front headers being mounted upon and supported by the supply box or mud drum 7 and the rear headers being mounted upon and supported by the rear supply box and mud drum 8. The headers, of course, are connected so as to communicate with their respective supply boxes 7 and 8. Upper boxes 9 and 10 are mounted upon and communicate with the upper ends of the front and rear headers 5 and 6 respectively. The front and rear headers are connected by a plurality of pairs of crossed tubes 11 arranged substantially in the same manner as shown in my pending application Serial No. 445,592. It is to be noted that the lowermost tubes 11 and the uppermost tubes 11 are arranged in single pairs instead of double pairs. See par-. ticularly Figure 1 of the drawings.

The upper ends of the headers 5 and 6 are connected by the series of pairs of tubes 12 and the boxes 9 and 10 are also connected by the plurality of tubes 13. The front and rear headers extend upwardly above the water level in the boiler, and, therefore, form part of the steam dome space.

The superheater construction is provided within the main boiler construction by means of the headers 5 in the front and corresponding headers in the rear. The front and rear headers of the superheater are provided with diaphragms or partitions 5" so that the steam is circulated from one superheater header to the other. These headers are blanked off from and do not communicate with the lower supply boxes or mud drums 7 and 8 but do have a separate box 14 by means of which they are connected together. The inlets to the superheater construction are designated by the reference character 15 and the outlet is designated by the reference character 16. The inlets are from the top boxes 9 and 10 previously described. The feed water pipes are designated generally by the reference character 17 having the inlet connections 18 and 19 in the front and rear headers 5 and 6 respectively.

Feed water being admitted into these headers circulates back and forth across the boiler down to the boxes 7 and 8 and thence upwardly through the other headers and their connecting tubes. The steam passes from each of the headers at the top into the boxes 9 and 10 which have the inlet connections 15 to the superheater headers 5. Furthermore the upper portions of the superheaters 5 and 6 are connected by the tubes 12 and the boxes 9 and 10 are connected by the tubes 13. After the steam passes through the superheating construction it is discharged through the superheater outlet 16.

It is to be expressly noticed that maximum heating surface and water capacity is provided without the use of drums, and furthermore that superheating is provided for within the boiler construction proper whereby maximum heating efficiency to obtain high pressure with a minimum amount of weight is accomplished.

What I claim is:

1. In combination in a boiler construction, a plurality of front headers and a plurality of rear headers and a plurality of sets of tubes connecting said headers and arranged in pairs extending in criss-cross relation from one header to the other, independent boxes mounted upon and communicating with the front and rear headers, and a plurality of sets of tubes connecting said boxes.

2. In combination in a boiler construction, a plurality of front headers and a plurality of rear headers and a plurality of sets of tubes connecting said headers and arranged in pairs extending in criss-cross relation from one header to the other, independent boxes mounted upon and communicating with the front and rear headers, and a plurality of sets of tubes connecting said boxes, and a plurality of sets of tubes connecting the upper portions of the front and rear headers,

3. In combination in a boiler construction, a plurality of front headers and a plurality of rear headers and a plurality of sets of tubes connecting said headers and arranged in pairs extending in criss-cross relation from one header to the other,

independent boxes mounted upon and communicating with the front and rear headers, and a plurality of sets of tubes connecting said boxes, certain of said front and rear headers constituting a superheater construction, and blanked off from communication with the rest of the boiler circulating system except at their communication with the upper boxes, said communication constituting the inlet to the superheater construction.

i. In combination in a boiler construction, a plurality of front headers and a plurality of rear headers, a plurality of tubes connecting the oppositely disposed front and rear headers and arranged in cries-cross relation with respect to each other, supply boxes connecting all the front headers together and all the rear headers together at their lower ends, a box connecting the front headers together and a box connecting the rear headers together at their upper ends, means for providing circulation between said last mentioned boxes and the upper portions of the front and rear headers, certain of said front and rear headers being blanked off from communication with the lower boxes but having communication with the upper boxes so as to form a superheater construction, and a box connected independently to the said last mentioned front headers at their lower ends.

5. In combination in a boiler construction, a plurality of front headers and a plurality of rear headers, a plurality of tubes connecting the oppositely disposed front and rear headers and arranged in criss-cross relation with respect to each other, a box mounted upon and communicating with the upper ends of the front headers and another box mounted upon and communicating with the upper ends of the rear headers, connections for conducting water to the end headers, the next adjacent headers serving as the superheater headers, connecting means between said superheater headers, said superheater headers having cornmunication only with each other and with said upper boxes.

6. In combination in a boiler construction, a plurality of front headers, a plurality of rear headers, a plurality of sets of tubes connecting said headers and arranged in pairs extending in criss-cross relation from one header to the other, independent boxes mounted upon and communicating with said front and rear headers, a plurality of sets of tubes connecting said boxes, and a plurality of sets of tubes connecting the upper portions of said front and rear headers, said headers extending above the normal water line in the boiler to form part of the steam dome space of said boiler construction.

JOHN J. CAIN. 

